Amongst the manifold challenges to effective governance in a state, corruption is probably the most important. Not only because it is pervasive at all levels in public life and the government, but also because of its covert, diffused, and transmuting nature. We give you, the top 5 most corrupt U.S. presidents in history - including both individual cases, as well as instances of rampant political corruption. From rampant land speculation, slave-holding, and patronage, to complicity, shadow government operations, and 'pay to play' politics, U.S. presidents have done it all.—Official Synopsis